MIPS R10000 Microprocessor User's Manual - SGI TechPubs Library

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242 Chapter 14. 14.5 PageMask Register (5) 31 The PageMask register is a read/write register used for reading from or writing to the TLB; it holds a comparison mask that sets the variable page size for each TLB entry, as shown in Table 14-6. Format of the register is shown in Figure 14-5. TLB read and write operations use this register as either a source or a destination; when virtual addresses are presented for translation into physical address, the corresponding bits in the TLB identify which virtual address bits among bits 24:13 are used in the comparison. When the Mask field is not one of the values shown in Table 14-6, the operation of the TLB is undefined. The 0 field is reserved; it must be written as zeroes, and returns zeroes when read. PageMask Register 25 24 13 12 0 MASK 0 7 12 13 Figure 14-5 PageMask Register Table 14-6 Mask Field Values for Page Sizes Page Size Bit (Mask) 24 23 22 21 20 19 18 17 16 15 14 13 4 Kbytes 0 0 0 0 0 0 0 0 0 0 0 0 16 Kbytes 0 0 0 0 0 0 0 0 0 0 1 1 64 Kbytes 0 0 0 0 0 0 0 0 1 1 1 1 256 Kbytes 0 0 0 0 0 0 1 1 1 1 1 1 1 Mbyte 0 0 0 0 1 1 1 1 1 1 1 1 4 Mbytes 0 0 1 1 1 1 1 1 1 1 1 1 16 Mbytes 1 1 1 1 1 1 1 1 1 1 1 1 Version 2.0 of January 29, 1997 MIPS R10000 Microprocessor User's Manual 0
Coprocessor 0 243 14.6 Wired Register (6) The Wired register is a read/write register that specifies the boundary between the wired and random entries of the TLB as shown in Figure 14-6. Wired entries are fixed, nonreplaceable entries, which cannot be overwritten by a TLB write operation. Random entries can be overwritten. Figure 14-6 Wired Register Boundary The Wired register is set to 0 upon system reset. Writing this register also sets the Random register to the value of its upper bound (see Random register, above). Figure 14-7 shows the format of the Wired register; Table 14-7 describes the register fields. Figure 14-7 Wired Register Table 14-7 Wired Register Field Descriptions Field Description Wired TLB Wired boundary 0 Range of Random entries Range of Wired entries TLB Reserved. Must be written as zeroes, and returns zeroes when read. MIPS R10000 Microprocessor User's Manual Version 2.0 of January 29, 1997 63 0 Wired Register This entry is Random, not Wired Wired Register 31 6 5 0 0 Wired 26 6
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MIPS R10000 Microprocessor User’s
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Acknowledgments This book represent
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About This Manual Glossary Stylisti
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Table of Contents vii Contents Ackn
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Table of Contents ix Superscalar In
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Table of Contents xi 3 Interface Si
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Table of Contents xiii 5 Secondary
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Table of Contents xv SysAD[63:0] Ad
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Table of Contents xvii 7 Clock Sign
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Table of Contents xix 9 Error Prote
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Table of Contents xxi 11 JTAG Inter
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Table of Contents xxiii 13 Packagin
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Table of Contents xxv Branch on Cop
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Table of Contents xxvii 16 Memory M
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Table of Contents xxix 18 A Cache T
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1. Introduction to the R10000 Proce
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Introduction to the R10000 Processo
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2. System Configurations The R10000
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System Configurations 35 2.2 Multip
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3. Interface Signal Descriptions Th
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Interface Signal Descriptions 39 3.
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4. Cache Organization and Coherency
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Cache Organization and Coherency 47
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5. Secondary Cache Interface The pr
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Secondary Cache Interface 61 5.2 Se
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Secondary Cache Interface 63 Indexi
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Secondary Cache Interface 65 Errata
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Secondary Cache Interface 67 SCTag(
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Secondary Cache Interface 69 4-Word
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Secondary Cache Interface 71 16 or
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Secondary Cache Interface 73 5.7 Wr
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Secondary Cache Interface 75 8-Word
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Secondary Cache Interface 77 Tag Wr
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6. System Interface Operations The
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System Interface Operations 81 6.4
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System Interface Operations 85 Mult
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System Interface Operations 87 Exte
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System Interface Operations 91 Outg
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System Interface Operations 97 Duri
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System Interface Operations 99 Erra
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System Interface Operations 101 Cyc
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System Interface Operations 103 Sys
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System Interface Operations 111 Mul
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System Interface Operations 113 Err
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System Interface Operations 115 Pro
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System Interface Operations 127 Ext
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System Interface Operations 143 Coh
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System Interface Operations 147 The
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System Interface Operations 149 In
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7. Clock Signals The R10000 process
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Clock Signals 157 7.2 Secondary Cac
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8. Initialization This section desc
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Initialization 161 Errata Vcc VccQ[
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Initialization 163 8.4 Soft Reset S
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Initialization 165 Table 8-1 (cont.
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9. Error Protection and Handling Th
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Error Protection and Handling 169 9
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Error Protection and Handling 177 D
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Error Protection and Handling 179 T
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Error Protection and Handling 181 E
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Error Protection and Handling 183 W
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Error Protection and Handling 185 P
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10. CACHE Instructions This chapter
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CACHE Instructions 189 TLB Refill a
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Page 225 and 226: CACHE Instructions 195 10.7 Index L
Page 227 and 228: CACHE Instructions 197 10.11 Hit In
Page 229 and 230: CACHE Instructions 199 10.15 Hit Wr
Page 231 and 232: CACHE Instructions 201 10.17 Index
Page 233 and 234: 11. JTAG Interface Operation Errata
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Page 237 and 238: JTAG Interface Operation 207 ‡ Wi
Page 239 and 240: 12. Electrical Specifications This
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Page 243 and 244: Electrical Specifications 213 Unuse
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Page 249 and 250: 13. Packaging The R10000 microproce
Page 251 and 252: Packaging 221 Electrical Characteri
Page 253 and 254: Packaging 223 Figure 13-1 R10000 59
Page 255 and 256: Packaging 225 Table 13-3 (cont.) Si
Page 261 and 262: Packaging 231 Figure 13-3 599LGA PW
Page 263 and 264: Packaging 233 Figure 13-5 599LGA Bo
Page 265 and 266: 14. Coprocessor 0 This chapter desc
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Page 269 and 270: Coprocessor 0 239 14.3 EntryLo0 (2)
Page 271: Coprocessor 0 241 14.4 Context (4)
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Page 277 and 278: Coprocessor 0 247 CU2 CU2 CU1 CU1 C
Page 279 and 280: Coprocessor 0 249 Diagnostic Status
Page 281 and 282: Coprocessor 0 251 Coprocessor Acces
Page 283 and 284: Coprocessor 0 253 Table 14-13 Cause
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Page 287 and 288: Coprocessor 0 257 14.15 Load Linked
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Page 291 and 292: Coprocessor 0 261 14.19 Diagnostic
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Page 297 and 298: Coprocessor 0 267 Event 1 for Count
Page 299 and 300: Coprocessor 0 269 Event 6 for Count
Page 301 and 302: Coprocessor 0 271 Event 14 for Coun
Page 303 and 304: Coprocessor 0 273 14.21 ECC Registe
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Page 311 and 312: Coprocessor 0 281 Errata Errata Sec
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Coprocessor 0 293 14.31 MFC0 Instru
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Coprocessor 0 295 MTPS 31 Format: M
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Coprocessor 0 297 14.34 TLBP Instru
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Coprocessor 0 299 14.36 TLBWI Instr
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15. Floating-Point Unit This sectio
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Floating-Point Unit 303 15.2 Floati
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Floating-Point Unit 305 Load and St
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Floating-Point Unit 307 63 63 Doubl
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Floating-Point Unit 309 Floating-Po
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Floating-Point Unit 311 Loading the
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Floating-Point Unit 313 Moves and C
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16. Memory Management This section
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Memory Management 317 Addressing Mo
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Memory Management 319 32-bit User M
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Memory Management 321 32-bit Superv
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Memory Management 323 32-bit Kernel
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Memory Management 325 0X BFFFFFFF 0
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Memory Management 327 64-bit Virtua
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Memory Management 329 Using the TLB
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17. CPU Exceptions This chapter des
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CPU Exceptions 333 17.3 TLB Refill
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CPU Exceptions 335 Priority of Exce
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CPU Exceptions 337 Soft † Reset E
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CPU Exceptions 339 NMI Exception Ca
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CPU Exceptions 341 TLB Exceptions T
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CPU Exceptions 343 TLB Invalid Exce
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CPU Exceptions 345 Cache Error Exce
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CPU Exceptions 347 Integer Overflow
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CPU Exceptions 349 System Call Exce
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CPU Exceptions 351 Reserved Instruc
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CPU Exceptions 353 Floating-Point E
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CPU Exceptions 355 Interrupt Except
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CPU Exceptions 357 17.5 COP0 Instru
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18. Cache Test Mode The R10000 proc
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Cache Test Mode 361 18.3 Entering C
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Cache Test Mode 363 18.5 SysAD(63:0
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Cache Test Mode 365 Auto-Increment
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Cache Test Mode 367 Auto-Increment
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A. Glossary The following terms are
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A.6 Dynamic Scheduling The R10000 p
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A.11 Nonblocking Loads and Stores M
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A.13 Logical and Physical Registers
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Index I-1 Index Numerics 16-word, c
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Index I-3 uncached accelerated, des
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Index I-5 branch on CP0 instruction
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Index I-7 F fetch pipeline 6, 17 fe
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Index I-9 TLBWR 285, 300 unsupporte
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Index I-11 NMI see also nonmaskable
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Index I-13 CP0 (description of) 235
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Index I-15 SysAD[20:16] interrupt r
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Index I-17 SysWrRdy, signal 41, 118
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